<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style type="text/css">
        /*需求 1：分别定义两个 div、span 标签，
          分别修改每个 div 标签的样式为：边框 1 个像素，实线，红色*/
        div{
            border: 1px solid red;
        }
        span{
            border: 1px solid red;
        }
    </style>
</head>
<body>
    <div>div标签1</div>
    <div>div标签2</div>
    <span>span标签1</span>
    <span>span标签2</span>
</body>
</html>